#!/usr/bin/python

import random
import sys
 

for i in range(1):
	tanda = random.randint(15,30)
	for i in range(tanda):
		if i == 0 :
			sys.stdout.write('%d' % tanda)
		sys.stdout.write(' %d' % random.randint(-20,10))
	sys.stdout.write("\n")
